uh, like how do i know if i have it. Are there test or something. And i thought only really skinny people could have low blood sugar?? I have a family history of diabetes, so it wouldnt be a surprize if i had it, but shouldnt i have high blood sugar and not low blood sugar? some symptoms are Nausea, Extreme hunger, nervous, jittery, rapid pulse, very big pupils(eyes), blurred vision, headaches, anxiety, nightmares, sweating, bad vision, cold skin, low body temperature, constant shivering and shaking, trembles, numbing, leg pains, mood swings, depression. very moody could this be symptoms of high blood sugar rather then low blood sugar